Chromalox Thermostat PK407 3 User Manual

Installation, Operation  
4
AR  
and  
(Supersedes PK407-3)  
PK407-4  
RENEWAL PARTS IDENTIFICATION  
161-562793-001  
MARCH, 2004  
Type AR Industrial Thermostat  
(Three Phase)  
2-21/32"  
4-3/32"  
Bulb  
Dia.  
Length  
(Refer to  
Specifications Table A)  
Specifications — Table A  
Sensing Bulb  
with 7’  
Standard Capillary  
Temperature  
Range  
Approx.  
Max.  
A.C. Rating  
(Amps)  
Dia.  
(In.)  
Length  
(In.)  
Model*  
AR-2153  
AR-2193  
AR-5153  
AR-5193  
(°F)  
Style  
3
60-250  
60-250  
200-550  
200-550  
5
9
5
9
/
8
41/  
103/  
31/  
4
3
/
16  
4
30 Amps  
@ 277 Volts  
3
/
8
4
3
2-21/32"  
/
16  
9
*Models equipped with Pilot LIght are designated by the suffix “P” on the Model Number.  
Models equipped with Knob Cover are designated by the suffix (KC) on the Model Number.  
Models equipped with both a Pilot Light and a Knob Cover are designated by the suffix  
“PKC” on the Model Number.  
Figure 1  
© 2010 Chromalox, Inc.  
 
WIRING  
6. Connect wires according to wiring diagrams (Figures 8 thru  
12). Note: Electrical connections should be made with gener-  
ous loops of wire — approximately 6” per lead.  
7. Replace cover, tighten screws, replace dial knob and dial knob  
cover.  
8. Note: If load amperage or voltage rating exceeds switch rating,  
a contactor must be used. Contactor and wiring to be supplied  
by customer.  
ELECTRIC SHOCK HAZARD. Disconect all power to  
heater before installing or servicing thermostat.  
Failure to do so could result in personal injury or  
property damage. Thermostat must be installed by a  
qualified person in accordance with the National  
Electrical Code, NFPA 70.  
1. Electric wiring to heater must be installed in accordance with  
local and National Electrical Codes.  
CAUTION: Use copper conductors only.  
2. Entrance for wiring is provided by two 1/2” conduit holes in end  
of base plate.  
3. If control is a “KC” model (Knob Cover), remove knob cover  
as in Figure 5.  
4. Set thermostat knob to OFF position and then remove knob by  
lifting knob from shaft. (See Figure 6)  
5. Loosen two screws from end of base plate and remove ther-  
mostat cover (see Figure 7).  
Figure 5  
Figure 6  
Figure 7  
6
5
3
5
3
6
1
2
4
4
2
1
L1  
L2  
L3  
L3  
Pilot Light  
(Optional)  
Pilot Light  
(Optional)  
L2  
L1  
Figure 8 — Three-Phase “Y” Load  
Figure 9 — Three-Phase Delta Load  
Note: One line (terminals 5-6) is controlled by the dial and is on continually whenever the dial is moved from the off position. The other  
two lines are thermostatically controlled and cycle with the rise or fall in temperature.  
CALIBRATION  
Thermometer  
Load (Tank, vat, die or platen)  
Figure 10  
Figure 11  
Figure 12  
If calibration is required, either one of two methods may be  
followed.  
1. If accurate measurement standards are not available, the ther-  
mostat can readily be adjusted to a known temperature stan-  
dard such as boiling water (212°F) (see Figure 10).  
2. With the aid of an accurate thermometer or other temperature  
measuring device, recalibration may be performed within the  
process as in Figure 11.  
ELECTRIC SHOCK HAZARD. Disconnect all power  
before attempting to calibrate thermostat. Failure  
to comply could result in personal injury.  
These controls are factory calibrated to the range indicated on  
the control adjustment knob.  
 
CALIBRATION (cont’d.)  
For either method the following general calibration procedures  
B. While holding the adjusting shaft (B) tightly, turn small  
center adjusting screw (A) with small screwdriver (C) until  
thermostat “clicks” (see Figure 12).  
should be followed.  
1. Remove knob cover, knob and thermostat housing as per  
instructions 3, 4 and 5 under WIRING.  
Note: Always use extreme care not to damage the slot in the  
2. Replace knob and turn to highest temperature setting.  
3. Slowly turn knob and when controls click “off”, compare the  
dial reading against the thermometer reading.  
4. If they do not agree —  
center adjusting screw.  
C. Each quarter turn of the screw will change the calibration  
approximately 30°F:  
— Clockwise to decrease temperature.  
A. Set dial knob to thermometer temperature reading and pull  
off knob.  
— Counterclockwise to increase temperature.  
D. Recheck calibration and repeat process if closer calibration  
is required.  
RENEWAL PARTS IDENTIFICATION  
0  
k  
1
4
2
3
Thermostat  
Thermostat  
Cover  
Model  
AR-2153  
AR-2153P  
AR-2193  
AR-2193P  
AR-5153  
AR-5153P  
AR-5193  
AR-5193P  
Sub-Assembly  
300-047848-002  
300-047848-002  
300-047848-001  
300-047848-001  
300-047848-004  
300-047848-004  
300-047848-003  
300-047848-003  
Dial Knob  
Base  
169-019604-001  
169-019604-001  
169-019604-001  
169-019604-001  
169-019604-002  
169-019604-002  
169-019604-002  
169-019604-002  
080-024763-001  
080-026032-007  
080-024763-001  
080-026032-007  
080-024763-001  
080-026032-007  
080-024763-001  
080-026032-007  
015-013819-001  
015-013819-001  
015-013819-001  
015-013819-001  
015-013819-001  
015-013819-001  
015-013819-001  
015-013819-001  
Limited Warranty:  
Please refer to the Chromalox limited warranty applicable to this product at  
1347 HEIL QUAKER BLVD., LAVERGNE, TN 37086  
Phone: (615) 793-3900  
 

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